<?php

/* 
 * Copyright 2015 gg.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Com\Wechat\Crypt;
/**
 * SHA1 class
 *
 * 计算公众平台的消息签名接口.
 */
class Sha1{
    /**
    * 用SHA1算法生成安全签名
    * @param string $token 票据
    * @param string $timestamp 时间戳
    * @param string $nonce 随机字符串
    * @param string $encrypt_msg 密文消息
    */
    public function getSHA1($token, $timestamp, $nonce, $encrypt_msg){
        try {
            $array = array($encrypt_msg, $token, $timestamp, $nonce);
            sort($array, SORT_STRING);
            $str = implode($array);
            return array(ErrorCode::$OK, sha1($str));
        } catch (Exception $ex) {
            return array(ErrorCode::$ComputeSignatureError, null);
        }
    }
}